Stasher · Food Storage Containers
Stasher Premium Silicone Reusable Food Storage Container
Lower PFAS concern, silicone containers don't require the coatings that trap PFAS, but brand offers no explicit disclosure.
Stasher's premium silicone food storage containers are made from silicone, which is inherently unlikely to contain PFAS since silicone doesn't rely on fluorinated coatings for water or grease resistance. However, Stasher does not publicly disclose PFAS testing or make explicit PFAS-free claims.
Shop Stasher on Amazon →Material
Food-grade silicone (no Teflon-family coating or Teflon-type coating)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
food packaging is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
Stasher containers are manufactured from food-grade silicone, a synthetic polymer that does not require fluorinated coatings or Teflon-type coating linings to achieve non-stick or barrier properties. Unlike hard plastics (polycarbonate, polyethylene terephthalate), silicone does not leach BPA or phthalates during normal use or heating, because these endocrine disruptors are not part of silicone's polymer backbone. Silicone's molecular structure is siloxane-based (Si-O bonds), which is chemically inert across typical food storage temperatures and pH ranges, making migration of toxic additives unlikely under standard conditions.
The brand's record and disclosure
Stasher has not published detailed ingredient disclosures, safety testing reports, or third-party certifications (e.g., FDA compliance letters, BPA-free affidavits) on its website or in product documentation. The brand markets containers as silicone-based and food-safe but does not explicitly address PFAS avoidance, formulation provenance, or manufacturing audit records. No significant recalls, contamination incidents, or regulatory warnings have been documented for Stasher silicone products in public safety databases. The lack of proactive transparency is a minor concern but does not indicate a known safety defect.
How it compares in its category
Stasher silicone containers occupy a middle ground between hard plastic containers (polypropylene, polycarbonate, higher microplastic and BPA migration risk over time) and glass alternatives (zero leach risk but fragile and heavier). Compared to other silicone storage brands (e.g., Ello, Rubbermaid Brilliance silicone lines), Stasher offers similar material chemistry but without stronger third-party certifications or transparency. The silicone material class itself is regarded as one of the safer food-contact polymers by consumer safety organizations, though no plastic is entirely risk-free in extreme conditions.
If you buy it
Store foods within the manufacturer's stated temperature range (typically -40°F to 400°F for silicone) and avoid prolonged heating in microwave or oven at the high end, as silicone can degrade and off-gas odors if overheated. Hand-wash or use the top rack of the dishwasher to minimize mechanical wear and staining; repeated abrasion can create microscopic degradation pathways. Replace containers if you observe persistent discoloration, odor, or visible surface erosion, as degradation may signal loss of polymer integrity. Store in a cool, dark place away from direct sunlight to slow oxidative aging of the silicone.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Microplastics from silicone degradation
Silicone is a long-chain synthetic polymer that can fragment under prolonged heat, mechanical stress, or UV exposure, generating microparticles; the degree and toxicity of silicone microplastics remain understudied, but degradation is physically observable in aged products.
BPA and phthalate leaching
Food-grade silicone does not contain BPA or phthalate plasticizers by formulation; no published studies or recalls document these compounds migrating from Stasher or comparable silicone containers.
Heavy metal residues in silicone
Food-grade silicone approved by regulatory bodies undergoes testing for lead and cadmium; no reports of metal contamination in Stasher products exist, though the brand does not disclose third-party metals testing.
Odor and taste transfer (not toxicity)
Silicone is known to absorb and retain odors and colors from stored foods, particularly strong spices or oils; this is cosmetic rather than a safety hazard but can indicate surface changes that may affect future performance.
Incomplete mold and bacteria removal
Silicone's porous surface and high contact area in collapsible designs can trap moisture and bacteria if not thoroughly dried after washing; proper drying and air circulation are required to prevent microbial growth, not a material defect but a use issue.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Food Storage Containers
Caraway
Food Storage Set
Glass containers with plastic lids
Lower concern; glass + plastic lids with stated PFAS-free position, but no third-party verification of lid material.
⚠Risky category by default
Caraway
Home 9-Piece Mini Food Storage Set
Borosilicate glass containers with plastic lids
Lower-concern option; glass containers avoid PFAS coatings, but verify lid material before purchase.
⚠Risky category by default
Caraway
Cream 6.6-Cup Non-Stick Glass Food Storage Container with Lid
borosilicate glass with non-PFAS lid
Lower PFAS concern, glass container with stated non-PFAS lid, though third-party verification absent.
⚠Risky category by default
More food storage containers grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.